Stop-motion for twisting-machines.



No. 77 3,038. v I PATENTED OCT. 25,1904. T. H. SMITH. STOP MOTION FOR TWISTING MACHINES. J

APPLICATION FILED JAN 7, 1904.

' K0 MODEL.

- avwcnl oz v No. 773,038.

' UNITED STATE Patented October 25, 1904.

PATENT OFFICE.

THOMAS HENRY SMITH, OF J AMESTOWN, NEW YORK.

STOP-MOTION FOR TWISTING-MACHINES.

SPECIFICATION forming part of Letters Patent No. 773,038, dated October 25, 1904.

' Application filed Jannary 1904.

To all whom, it may concern:

Be it known that I, THOMAS HENRYSMITH, a citizen of the United States, residing at J amestown, county of Chautauqua, and State of New York, have invented a new and useful 1m provementin Stop-Motions for Twisting-Machines, of which the following, taken in connection with the accompanying drawings, isa full, clear, and exact description.

My invention is an improvement on my former Letters Patent, No. 549,859, dated November 12, 1895; andthe object of my improvement is to simplify, cheapen, and perfect my former stop-motion device in such a manner as to giveit a wider range of appli cation, allowingof the successful use of astiii tongue, and to give added celerity and ease to its admission and release from the twistingrolls and greater durability to the wearing parts.

In the drawings, Figure 1 is a side elevation of the roller-stand with the improved stop-motion device attached to the cap-bar and in position on the thread. Fig. 2 is an elevation of the same with the thread broken and the rolls stopped and thread held by the pivotal tongue. Fig. 3 is afront elevation of a portion of the roller-standwith stop-motions attached to the cap-bar, one resting on the thread and the other-With the thread broken. Fig. 4 is a perspective view of the stop-motion attachment with the pivotal tongue raised,the raised position of the tongue being shown in dotted outline. Fig. 5 is a detail view of a modification of the upper end of the stop-motion device, showing a double Serial No. 188,020. No model.)

revolved by frictional contact with the lower roll. Above and to the rear of rolls 13 are arranged thespools 14 on a suitable creel, so

that the threads from the spools 14: descend through a guide 15 and over the front of twisting-roll13 and rear of roll 11, then forward to a guide 16, leading to the bobbin below.

The improved stop-motion attachment 17 is composed of a wire which is bent atright angles at 18 (see Fig. ,4) for hinging to the cap 12 between the ends of the rolls 13, near the front bite of rolls 11 and 13, by suitable cap 19. Usually the attachment at one side is sufficient, though the double attachment or bridle shown in the modification in Fig. 5 would not depart from my invention. Wire 17 is bent in a loop or offset 20, which extends across the lower front part of rollers 13. A metal tongue 21 is usually pivotally mounted on the upper wire of loop 20, so that the tongue rests on the lower wire of the loop, which is also nearest to the bite of the rolls, the relation of the parts being such that tongue 21 is thereby held in such a position as tofeed directly into the opening or bite of the rolls-11 and 13 and be drawn in by the revolving rolls when the thread breaks, the lower wire forminga stop to guide the tongue to the bite. Loop should be of sufficient length and leg 23 should be turned down at such a point as to hold the tongue in the middle of the roll.

It is desirable to regulate the'length of that part ofthe tongue 27 which is drawn into the rolls for a number of reasons: First, when a machine is stopped the tension of the threads slackens and allows all of the stop-motions along the entire length of the machine to drop down somewhat and the ends of the tongues begin to feed in between the rolls. The tension on the yarn is Weak, and when the machine starts again thetongues without the crimps 22 will feed in so far that the strength of the yarn is insufficient to pull them out, and the whole side breaks down. Consequently a stop must be placed in the tongues, so. that they cannot feed in so far that the threads cannot pull them out when themachine is started. Second, when a thread breaks down, as shown in Fig. 2, the shorter the tongue which effectively stops the top roll the easier the withdrawal of said tongue and the easier it is reset. This minimum length of tongue releases easily, and there is no danger that the tongue will extend through between the rolls and cut the thread. Constant wear on the edge of the tongues often makes them as sharp as knives, and unless the length is regulated they will cut the threads. Third, the hard metal of the wire leg must not be allowed to come in contact with the roll or it will cut a groove in the smooth surface of the roll and impair its use. For these reasons the tongues 21 are made of soft metal, preferably German silver, or some such metal which works well with steel and does not wear the rolls. An ofiset or crimp 22 is made across tongue 21 as a stop to limit the length of that part of the tongue which is drawn in between the rolls. The curve of the soft metal offset bears against the revolving lower roll when the tongue enters between the rolls, and while it regulates the length of tongue it does not wear the roll. Wire 17 extends down from loop 20 in a curved leg 23, having an eye or loop 80 on its lower end, through which the thread is inserted.

In operation the thread descends'from the spools and passes around the rolls, as above described, passing through eye 24 of the stopmotion device, causing the wire leg to rest on the thread as it passes to the bobbin below and holding the tongue 21 opposite the bite of the rolls. As soon as the thread breaks the Wire falls and tongue 21 passes into the bite and is drawn in between the rolls as far as to stop 22, instantly stopping upper roll 13 and holding the yarn until the operator can tie up the thread and release the rolls. As soon as the thread is tied up the wire is reset on the thread and the twisting goes on as before.

The attachment of the stop-motion to the front of the cap-bar allows of the simple hinge shown for the upper end of wire, thus cheapening and strengthening the construction. It also allows greater latitude of attachment. The breakage of ends in drawing out makes desirable in some cases a differential in lever lengths. It allows of the easier removal of the top roll and the roll has no frictional contact with the device.

I claim as new 1, In a stop-motion for twisting-machines, upper and under friction-rolls, a cap-bar ha ving caps or brackets thereon to support said upper rolls, a curved leg having the upper end hinged to the front of the cap near the front bite of the rolls, an eye for the thread on the lower end of the leg, a bend in said wire leg opposite the bite of the rolls, and a sheet-metal tongue pivotally mounted on said bend and held opposite said bite.

2. In a stop-motion for twisting-machines, friction-rolls and a suitable cap-bar, a wire leg hinged to the cap-bar and bearing on the thread, a return-loop in said leg opposite the bite of the rolls, and a metal tongue pivotally mounted on one side of said loop and resting on the other side.

3. In a stop-motion for twistirig-machines, friction-rolls and a suitable cap-bar, a curved leg having a hinged attachment to a point on the cap-bar nearest the bite of the rolls, an eye on the lower end of said. leg for the thread, a loop in said wire opposite the bite of the rolls, a sheet-metal tongue pivotally mounted on one side of said loop, and the other side of the loop formed as a stop to guide the tongue to the said bite of the rolls.

4:. In a stop-motion for twisting-machines, friction-rolls and a suitable cap-bar, a curved leg having the upper end pivotally mounted on the cap-bar and an eye on its lower end for the thread, a loop in said wire opposite the bite of the roll, a sheet-metal tongue pivotall y mounted on one side of said loop and the other side of the loop forming a stop to guide the tongue and said leg given its downward turn near the middle of the rolls to hold the tongue in place.

5. In a stop-motion for twisting-machines, friction-rolls 11 and 13 for the thread, a capbar 11 having caps 11, a wire leg 17 having a hinge 18 19 to cap 12 and an eye 2a for the thread, a loop 20 in said leg, a tongue 21 pivotally attached to said loop, and a stop 22 in said tongue.

In testimony whereof I have signed my name to this specification in the presence of two subscribing witnesses.

THOMAS HENRY SMITH.

Witnesses:

CHAS. M. BROWN, S. A. BALDWIN. 

